Multistage centrifugal pump.



A. V. MUELLER.

MULTISTAGE CENTEIFUGAL PUMP.

APPLICATION FILED APR. 1 6, 1914.

A. V. MUELLER. MULTSTAGE CENTRUUGAL PUMP.

APPLIGATIQN FILED APR. 1G. 1914.

l l 30,422. Patented Mar. 2, 1915.

2 SHEETS-SHBET 2 ahve/nto@ narran srl-iras reruns;

Annxnnnnnlv. Mummert, on osvvneo, new Yoan.

MULTISTAGE CENTRIFUGAL PUMP.

Specification of Letters Patent.

Patented Mar, 2, 15H5.

Application led yApril 16, A1914. Serial No. 832,294.

To all whom it may concern:

Be it known' that l, ALEXANDER V. MonL- Lnn," a citizen of the United States, residing at Oswego, in thev county of Usvvego and State of New York, have vinvented certain new and useful improvements in lvultistage -Centrifugal Pumps, of which the following is jeciication. t "This invention relates to certain improve.-` ments in and relating to centrifugal pump- Aing machinery; and the objects and nature ofthe invention will be readily understood by 'those skilled in the. art in the light of the "following explanationof the accompanymg drawings illustrating what I novil believe to be'the preferred embodiment or mechanical eX ression of my invention from among otl'ibr formations, constructions, arrangements and combinations .Within the spirit and scope of the'invention.

An objectf the invention "is to provide improvements in turbine pumps, and the like, of the vertically split type, whereby such pumps' can be dismantled Without breaking or disconnecting the suction and discharge connections.

A further object of the invention is to .provide aturbine or multi-stage centrifugal pump composed of parallel vertical or transverseistages and sections capable of being separated -or taken apart .Without breaking'thesuction and discharge connec- 'tionaQand whereby the pump Acan be dismantled Within an exceedingly' restricted space.' y

A further' object loi the invention is to provide a turbine or multi-stage centrifugal pump of the vertically split typehaving the suction and discharge connections at the same end of` the',A ump, whereby the pump can be clisntan,t`lei)vvithin al restrictedspace extending a minimum distance beyondl the pump end, and without disturbing the suction an'ddischarge connections.

A further object of the invention is to provide certain improvements "in vertically turbine vor multi-stage centrifugal peto attain the advantagesoi the hori- 'ZOII-lally split turbine pumps and' avoid the serioufsdisadvantages thereof and to render it'possible to dismantle such vertically split pumps in close' quarters Where end room rof only few inches is allowed I 4 A further object ofthe invention is to providexavertically split turbine or multistage pump wherein the suction and `disments, and structures described, nor to an charge connections are lat the same end of the pump and the discharge liquid is returned to said end of the pump Without the employment of outside piping or substantial vadditional parts.

A further object of the invention is to provide a turbine or multi-s'tagel pump wherein one end head or casting is formed With both the suction and discharge openmA In the particular' example illustrated, I

show a multi-stage pump and a driving motor a, therefor approximately alined and arranged end to end and both mounted on a common base or bed h, with the motor-shaft c, operatively connected with the pump shaft 18, to drive the same, through the medium of al separable shaft coupling consisting of female membery 2.0, fixed on thel motor shaft end, andimalemember l5, fixed on the pump shaft end and having one or more vcoupling pins 19, removably entering member 20, and whereby the coupling members are operatively Connected, However, my invention is not restricted to the particular arrangepartic'ular pump shaft driving means.'

The-particular pump example illustrated, comprises a vertical hollow-'end head 13, preferably composed of a single' casting having the pump suction inlet 13a, and the pump discharge or outlet 13b. The casting is formed with' a flanged exterior nipple 13,

thev peripheral portion of said head to provide' means for the attachment of the pump suction pipe indirect communication with and opening into the suction inlet 13a. Said casting is also formed with a flanged exterior'v nipple 13d, projecting upwardly from the top edge or peripheral portion of said head to provide means for the attachment of the pump `discharge pipe opening into the discharge outlet 13b. lHowever, l do not wish to limit my invention to anv parprojecting horizontally and radially from Slo renault of the sur in said head or ticuler arranf ,I snai "ieu ,n in, prin/ide for the ati ent oi sucticx large pli s. Y in stance, the suction inlet is in the torni. ot a horij/iohtal radial passage at its 'inner end openin into the annular suction chamber 13e, arranged Within the center et' the casting and having an inlet opening 13g, at the inner side ot' said casting, and 'around the pump sha1-t, while the discharge outlet 13, in the forni of a `vertical radial. passage, shorter .than passage livand at its inner end opening into apliroxiniately annular discharge or pressure chamber lf, exteriorly surrounding suction chamber 13e, and Within said casting shut oill from communication therewith. rDie i pressure chamber lf, has side inlet openings through the inner vertical face of the casting. The outer sidewall of tliecenihal chamber 130, is preferably lformed by a casting l?, centrally receiving the pump shalt and removably and. snuglyV itted in a central opening through the outer side ot the end head 13, and forming a stud'- ing box for said sh aft provided with gland '21 although my invention is not so limitede lr so desired this stelling box can be non really lixedly' (although reinovalol* held in the opening in the end head by tie'bracket lita, removably clamped and secured to the outer side of the end head by nuts lei", on bolts or studs projectingoutwardly roin the end head removably through said bracket. 'ifhis bracket -t, carries the pinnpY shaft bearing or journal box 14, arranged between the stuiunn box land 2l and the shaft coupling member l5, and spaced from both. y

Any suitable mimber of'vertical 'stages or easing sections are arranged side by side at the inner face of the suction and -discharge or end head 13, and alined ltherewith and between the saine and the outside or opposite end head 5, which usually forms the closed outer end Wall of the pump through which the pump shaft passes cen- 1 trallv and which is usually provided With stuhng box for the shaft. A suitable outwardly projecting bracket 2, is usually-removably secured to the end 5, by nuts 2a, on bolts or studs fixed to said. head and this bracket carries a suitable journal box or 'ln the particular example illustrated, l

show verticall parallel casing sections or stages T, 9,v 11, arranged between the two .shaft within these sections and the heads, ll

arrange therunners or impellers 12, l0, 8 and li, and these runners are removably mounted on and normally clamped to rotate with said shaft in any usual or suitable manner. The suction inlet of the impeller 12, registers with theannular outlet 13g, of the suction chamber inthe head 13, and the casing sections and head 13, form any suitable or usual passages E23, by Which 'the discharge from each impeller is carried inwardly to the inlet ofthe next impeller. However, the last section 7, and the outer end head 5 form one or more pressure or discharge passages 23a, to receive the dis' charge from the last nnpeller 6, and deliver the saine outwardly tangentially 'or radially to the receiving or rear end or ends of the longitudinal return passage or passages 24E, extending through the pump casing to the pumpl discharge chamber lSf, in the casing section having the pump suction and discharge openings. flhe front or discharge ends of these longitudinal passages 24, reg' ister 'with the side inlet openings of the discl'iarge chamber 13"', and into which pas sages 24, discharge. The rear head 5, forms a rear Wall for the receiving ends of passages 24, While the sections 7, 9, 11, are formed' with annular series of transverse openings through their outer peripheral portions shut ofi from passages 23, and these openings reeister when the sections are clamped tightly together and between the heads and form the return or longitudinal passages 24.

So far as l ain aware, it has not been heretofore possible to dismantle a vertically split ioo multistage or turbine piirnp, in Whole or in part, Without disconnecting or breaking either the pump suction connection or the pump discharge coi'inection and encountering other objections and diiiculties. However, by providing one section of the pump with both the suction and discharge outlets, l am enabled to remove the remaining sections, and in fact, the shaft and impellers without disturbing said one section. and the pump suction and discharge connections, and in fact, this difunantling can be done without utilizing niorevthan a few inches of iooinhej/.fond the outer or rear end of the pump, whereby l' overcome the serious Dfaults the-n reinovedso that the head 5, impeller 6,

-iaeonea of turbine pumps having horizontally split lcasings While producinga turbine pump While my invention is not restricted to the section and impeller formation and arrangementillustrated, or to the particular pump shown, yet to give an illustration of hoW a pump4 according to my invention, can be dismantled, I might say-that in the construcy tion illustrated, 'the dismantling operation begins at .the rear or outer end of the pump, and hence the bracket 2 Will first be released from the end head 5, and removed from the pump sha-ft with bearings 2", 1,' The through or clamping bolt 3 are then re moved. The nut 4, on the pump shaft is section 7, iinpeller 8, section 9, impeller 10, section J11, and impeller 12, can then be reinovedin the order named. The maximum end. rooin required beyond the rear end of the shaft, to permit the removal -of these parts, is equal to the thickness longitudinally of the shaft of the Widest part but in any case it is but a few inches. With the parts just mentioned dismantled or removed, there is ordinarily no additional dismantling necessary as access can then be had to all parts removed and remaining set up.

However, should it be necesary to remove the pump shaft it is even then not necessary todisturb the casting 13, and the suction and discharge connections. If it is necessary afterthe casing sections and impellers have been removed, to remove the shaft, the bearing bracket 1li, is released from the casting 13 by removing the nuts lib, and the bearing of journal box 14 is then removed from the shaft as said box is usually' provided 'with a removable top cap and hence end room is het under such circumstances needed for the removal of this bearing or box, and the space between bearing or box and the coupling member 15is sufficient to permit the movement of the bracket 14a, to clear said bracket from the bolts or studs receiving thenuts 14". The stuffing box 17, which was held in place by bearing bracket 14;, may

-now be moved longitudinally on the pump shaft from vthe casting 13, toward the coupling member 15, so that'the pumpA shaft can be moved toward the right to disengage thecoupling pin or pins 19, fromvthe coupling member 20, and thus enable the shaft to be swung laterally clear of the'coupling member 20, and removed longitudinally and i toward the left from the casting 13. This swinging movement of the shaft is permitted by reason of the enlarged diameter of the outlet opening 13g, with respect to the diameter of the shaft. After this explanation of the method which can be followed in dis mantling a pump embodying my invention,

those slnlled in the art Will readily under-- stand hovv the pump parts can be assembled and how sections can be added thereto or removed therefrom to increase or decrease the capacity of thepump.

Peculiar advantages are attained by constructing'the pump casing or shell to permit lateral swing of the pump shaft, after the pump has been dismantled, as l am thereby enabled'to remove the shaft longitudinally from the combined suction and discharge casing section remaining set up, Without disturbing the motor and its shaft, and With'- out disturbing the fastening means between the coupling members 15, 20, and the shafts and in fact Without disturbing the positions of said members onsaid shafts. The pump shaft can be as readily again inserted in the yfixed section and thenswung to place in aliiiement with the motor shaft so that the tivo coupling members can be brought into operative engagement.

It is evidentthat various changes, variations, and modifications might be resorted to, that features might .be omitted and elements might be added Without departing from the spirit andV scope of my invention, and hence l do not wish to limit myself to the exact disclosure hereof.

Desiring to protect my invention as broadly as is legally possible, what I claim is C l 1. A multi-stage centrifugal pump coinprising end heads, vertical transverse casing sections, vsaid heads and sections being reico movably secured together, a pump shaft,

and removable impellers, one of said heads being providedrwith the suction inlet and the discharge outlet of the pump; whereby one end head provided with the pump. suction inlet and with the pump discharge outlet, substantially as described; J

4. A multistage centrifugal pump comprising removable parallel sections clamped together' end to end and removable longitudinally of the pump shaft, one' end section provided with the pump suction inlet and the pump discharge outlet, .said sections vproviding a longitudinal return passage rom the opposite end of the pump to said section provided with said outlet.

5. A multistage centrifugal pump coinprising parallel casing sections secured reien movably together end toV end and removable longitudinally of the pump shaft and pro viding passages' for the How of the liquid operated on by the pump yfrom the pmnp suction inlet at one end of the pump to the opposite end of the pump and providing a return discharge passage longitudinally of, the pump and to the pump discharge outlet at said end of the pump provided with the suction inlet.

6. A multistage centrifugal pump of the vertically split type having one of its casingsections provided with the pump suction and discharge openings, vvherebv the remaining casing sections of the pump can be removed Without disturbing the pump suction and discharge connections.l

7. A multistage centril'gal pump of the vertically split type having its suction and discharge openings both arranged at the same end of the pump to permit dismantling of the pump Without disturbing the pump suction and discharge connections 8. A multistage centrifugal pump of the transversely split or annular section type,

. having its impellers and passages arranged to drive the fluid from the suction end of the pump to the opposite end thereoil and to return the same longitudinally within the pump casing to the suction end of the pump, said suction end of the pump being provided with the pump discharge outlet.

9. A multistage centrifugal pump having its casing huilt up of transverse parallel sections secured together end to end, said sections comprising a casting having a suction chamber with a suction inlet extending to the exterior of the casting and a discharge chamber having a discharge outlet extending to the exterior of the casting.

l0. il multistage centrifugal' pump hav ing its casing composed of transverse hol-- low sections secured together end providing` passages 'forv liquid suction end of the pum i Y thereof and baclr te th `ction erm; s suction end of the pump having; the pump suction inlet to suction chan'iber, and haw ing un independent discluirge chamber receiving said return loiv and provided with the pump disch rg'e outlet. i

11. A nuiltistage centrifuga-l pump hav ing an end head formed with central openopes of this patent may he obtained for cents each, by addressing the :emessa ings enlarged with respect to the pump sha to permit lateral swing of the shart there and' longitudinal Withdrawal of the shaft the pump is otherwise difftion Without disturbing said coupling hers on their respective shafts.

13. A multi-stage centrifugal pump cem-- prising removable transverse casing secN tionsa one of which is arranged to remain set up when the pump is otherwise dis mantled, and a pump shaft laterally able in and longitudinally removable .torm vfardly trom said one section when pump is dismantleol7 ill. A multistage centrifugalpump conig'nising a pump shaft, parallel removable 'transverse casing sections, one of said sections adapted to remain set up when the casing` is otherwise dismantled, said section having enlarged central oienings through which said shaft extends, and a stuling box for said shaft and removablysecured to said section and occupying one of said openings.

l5. il multistage pump .cemprising# removable casingsections, one olf which is adapted to remain set up when the casing is otherwi dismantled, a longitudinal pump shafti a driving' shalt aiined with said 'nunp shalt, and a separable coupling operativi, connecting the ends of said shafts, s d pump shaft being removable from section and toward said drivingT J" i 1 Shall Willa-pl dismantled and ai .l v*

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lil/itnesses firmar Sivrecurrg lerne C. Huisnr,

Cmrmissener of Fatt "Washington, il. il, 

